Win 7 Ultimate VS Win 8.1 Ultimate

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as this is a big community i like to ask if it makes sense to clean my pc and give it a go with Win 8.1 Ultimate? I have the possibility to get it for free (legal for sure) but i`m not sure if i really should went from Win 7 Ultimate up to Win 8.1 Ultimate. Are there any improvements to expect?

I'm not lazy, I'm just very relaxed.StaffPremium

@Marc
Well m8, Win 10 will be FREE for the first year from Microsoft via Update, when you have WIN 7 or 8 on your PC (Legal copy).
So, maybe you stick to WIN 7, as I do, and wait for WIN 10 to come out. On the Microsoft page there is a Newsletter for Upgrading to WIN 10 for free. Or use google for it. But that you know allready...
Cheers,
Andrew
- Have FUN out there. -